Abstract: Some years after the publication of Vol. III/11 and its supplement III/18 dealing with elastic, piezoelectric, pyroelectric and optical properties of crystals, a complete recompilation of the data of these volumes and of new data was performed. Because of the growth of this subject matter it was found convenient to divide the material into four volumes, III/29a and b for the low frequency properties and III/30a and b for high frequency propertiesof dielectric crystals. The present second subvolume III/29b essentially contains relative dielectric constants and piezoelectric constants and their temperature coefficients, as well as electrostrictive and pyroelectric coefficients and electromechanical coupling factors of dielectric crystals.